Commits on Dec 10, 2018

1. Add CalculationTools base and entry point aiida.tools.calculations …

   With the migration to the new provenance design, the type string of
   calculation nodes, no longer refer to the actual sub class of the
   `JobCalculation` that was run, but just the base `CalcJobNode`. The
   actual class of the calculation process was stored in the `process_type`
   if it could be mapped onto a known entry point.
   
   However, this change means that when a user now loads a node of a
   completed calculation node, let's say `PwCalculation`, the loaded node
   will be an instance of `CalcJobNode` and not `PwCalculation`, which means
   that any utility methods defined on the `PwCalculation` class are
   inaccessible.
   
   We can return this functionality through the concept of calculation
   tools, which will get exposed through the `CalcJobNode` class and will
   load a specifically registered entry point.

   

   sphuber committed Dec 10, 2018
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